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Antibody data in vaccination versus SARS-CoV-2 infection. A, Maternal IgG, *P = .001. B, Transfer ratio (infant IgG:maternal IgG), P = NS. C, Infant IgG, *P = .001. D, Maternal IgM, *P = .001. E, Infant IgM, P = 1.0. Comparisons were made using Mann-Whitney U tests. Abbreviations: AU, arbitrary units; COVID-19, coronavirus disease 2019; IgG, immunoglobulin G; IgM, immunoglobulin M; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
